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吴奕橦 · 2023年11月04日

公式里的B是什么啊

NO.PZ2022123001000031

问题如下:

Afund had the following experience over the past 10 years:


The target semideviation of the returns over the 10 years if the target is 2% is closest to:

选项:

A.

1.42%

B.

1.50%

C.

2.01%

解释:


The target semi-deviation is the square root of the sum of the squared deviations from the target, divided by n − 1:


这个表格右侧的三个数怎么算出来的,麻烦举个例子

1 个答案

星星_品职助教 · 2023年11月05日

同学你好,

表格中写明了算法为 deviation squared below Target of 2%。公式中的B为target,即所有小于target的数字都要考虑,本题中B为2%。



以第一个数字0.000025为例,对应的是1.5%,小于2%,所以要计算。“deviation”为1.5%-2%=0.005,“deviation squared”为将其平方。结果即为0.000025.

其余2个数字的计算同理。


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